An FRP-anti-corrosion wood composite truss structure

Abstract

The present invention discloses an FRP-anti-corrosion wood composite truss structure, which includes an FRP profile tension member, an anti-corrosion wood rod compression member, and a metal joint; the FRP profile tension member includes an FRP profile and double sleeve connectors located at both ends of the FRP profile, the anti-corrosion wood rod compression member includes an anti-corrosion wood rod and sleeve connectors located at both ends of the anti-corrosion wood rod, and multiple FRP profile tension members and anti-corrosion wood rod compression members are connected through metal joints to form an FRP-anti-corrosion wood composite truss structure. By combining the FRP profile and the anti-corrosion wood rod into a truss structure through a specific joint connection method, the mechanical properties of each material are fully utilized. The amount of metal material used in the entire truss structure is very small, reducing the consumption of non-renewable energy; the FRP-anti-corrosion wood composite truss as a whole exhibits the mechanical properties of light weight and high strength, and its seismic performance and anti-fatigue performance have been greatly improved compared with steel trusses and reinforced concrete trusses.

Description

Technical Field

[0001] The present invention discloses an FRP-anti-corrosion wood composite truss structure. Background Art

[0002] Fiber Reinforced Polymer (FRP) is a high-performance composite material composed of fiber materials and matrix materials through specific processing techniques. It has the advantages of light self-weight, good chemical corrosion resistance, good insulation performance, simple molding process, high tensile strength, etc. The FRP profiles formed in one step are more environmentally friendly than traditional concrete materials and steel. Wood is widely used in traditional building structures and is a renewable environmental protection building material. At present, the application of wood anti-corrosion technology has greatly improved the corrosion resistance of wood, enabling wood to be better applied to various building structures. Currently, the global consumption of steel is very large, and steelmaking requires a large amount of non-renewable energy. Therefore, it is necessary to explore a new type of structural material to replace steel. In recent years, experts in the field of civil engineering have done a lot of work on the application and promotion of FRP. However, the application of FRP in engineering practice is still relatively few. The key lies in the anisotropic characteristics of the FRP material itself, and the connection problem between its materials has not been broken through.

[0003] In the patent document with the publication number CN204510471U, an FRP-wood composite truss structure is disclosed. This patent uses square timbers, FRP slats, wooden web members, and reinforcement plates to form a composite truss structure. Mortise joints are used between the woods, and epoxy resin bonding is used between the wood and the FRP. This patent does not clearly define the specific material and cross-sectional form of the reinforcement plate. The truss structure form is single, and the contact area at the connection between the square timber and the FRP slat is small. Using epoxy resin bonding may not necessarily achieve the expected effect.

[0004] In the patent document with the publication number CN110056118A, an FRP space truss sea sand concrete slab structure is disclosed. The truss structure described in this patent is a space truss structure, and all components in the truss are made of FRP material. The connection nodes adopt FRP threaded sleeve spherical nodes. This patent does not consider the characteristic that the self-weight of the structure is relatively large after the concrete slab is poured. The simple threaded connection between the FRP components and the spherical nodes far fails to meet the requirements of the joint connection strength under the structural stress state.

[0005] In the patent document with the publication number CN102505638A, a preparation method of a main load-bearing resin matrix composite-steel truss composite structure is disclosed. All components described in this patent are FRP tubes, and the implementation steps of their joint connection are as follows: First, connect the pre-tightening force ruler joint with the FRP tube to form a component, and then connect the components by welding. In this patent, there are many teeth at the end of the FRP tube, which destroys the integrity of the component and causes a decrease in local strength. In addition, the process of cutting teeth on the FRP tube is cumbersome, with high requirements for the accuracy of parts, and the cost is greatly increased.

[0006] In summary, in the existing publicly disclosed patents, there are mostly problems with the layout form of truss structure components and the joint connection method, the functions are not comprehensive enough, and the promotion significance is not great. Summary of the Invention

[0007] In order to solve the above technical problems, the present invention provides an FRP-anti-corrosion wood composite truss structure with a simple structure, good seismic and anti-fatigue performance, and low maintenance cost.

[0008] The technical solution of the present invention to solve the above problems is: an FRP-anti-corrosion wood composite truss structure, including an FRP profile tensile member, an anti-corrosion wood rod compressive member, and a metal joint; the FRP profile tensile member includes an FRP profile and double sleeve connectors located at both ends of the FRP profile, the anti-corrosion wood rod compressive member includes an anti-corrosion wood rod and sleeve connectors located at both ends of the anti-corrosion wood rod, and multiple FRP profile tensile members and anti-corrosion wood rod compressive members are connected through metal joints to form an FRP-anti-corrosion wood composite truss structure;

[0009] The double sleeve connector is integrally formed, including an inner sleeve, an outer sleeve, and an end sphere. The inner sleeve is sleeved in the outer sleeve, and the gap between the inner sleeve and the outer sleeve is used to insert the FRP profile. A number of ribs protruding from the pipe wall are evenly distributed axially on the outer wall of the inner sleeve and the inner wall of the outer sleeve to fix the position of the FRP profile in the double sleeve connector. The FRP profile is inserted into the gap between the inner sleeve and the outer sleeve and is bonded by pouring epoxy resin glue between the inner and outer sleeves to form an FRP profile tensile member; one end of the inner sleeve and the outer sleeve are connected together and connected to the end sphere through a cylindrical rod. Metal ribs are evenly distributed radially along the cylindrical rod at the connection of the cylindrical rod and the outer sleeve, and through holes are provided on the end sphere;

[0010] The geometric form of the FRP-anti-corrosion wood composite truss structure is any one of a triangular truss, a trapezoidal truss, and a polygonal truss.

[0011] For the above FRP-anti-corrosion wood composite truss structure, the outer diameter of the FRP profile is smaller than the inner diameter of the outer sleeve, and the difference range is 0.1 - 5 mm. The inner diameter of the FRP profile is larger than the outer diameter of the inner sleeve, and the difference is the same as the difference between the outer diameter of the FRP profile and the inner diameter of the outer sleeve. The axial length of the outer sleeve is more than 1 times the outer diameter of the FRP profile, and the length of the inner sleeve is more than 1.5 times the length of the outer sleeve. Both the inner sleeve and the outer sleeve have a variable cross-section form with a larger wall thickness at the spherical end near the end and a smaller wall thickness at the other end. The maximum wall thickness is more than 1 times the wall thickness of the FRP profile, and the minimum wall thickness ranges from 0 to 0.5 times the maximum wall thickness.

[0012] For the above FRP-anti-corrosion wood composite truss structure, the sleeve connector is integrally formed and includes a metal sleeve, a radial strengthening section, bolts, a cylinder, and an end sphere. A raised radial strengthening section is provided in the middle of the outer wall of the metal sleeve. A number of threaded holes are evenly distributed radially on the radial strengthening section, and the direction of the threaded holes points to the centroid direction of the cross-section where they are located. Bolts matching the threaded holes are inserted into the threaded holes to apply a pre-tightening force to the anti-corrosion wood rod inserted into the metal sleeve. The number of bolts distributed radially is determined according to the cross-sectional size of the anti-corrosion wood rod. The anti-corrosion wood rod compression member is composed of an anti-corrosion wood rod inserted into the metal sleeve and combined by tightening the bolts. The end of the metal sleeve is connected to the end sphere through a cylinder. Stiffening ribs are evenly distributed radially at the connection between the cylinder and the sleeve, and a through hole is provided on the end sphere.

[0013] For the above FRP-anti-corrosion wood composite truss structure, the outer diameter of the anti-corrosion wood rod is the same as the inner diameter of the metal sleeve. The length of the metal sleeve is more than 1 times the outer diameter of the anti-corrosion wood rod, and the wall thickness of the metal sleeve is more than 0.05 times the outer diameter of the anti-corrosion wood rod. The raised thickness of the radial strengthening section is the same as the diameter of the bolt, and the axial width of the radial strengthening section is 2 times the diameter of the bolt.

[0014] For the above FRP-anti-corrosion wood composite truss structure, the metal node is divided into two parts, A and B, both of which have a stepped shape with a thin edge and a thick middle and are integrally formed. Spherical grooves for placing the end sphere or the end sphere body are distributed on both parts A and B. Cylindrical pins are distributed on part A. The pins are divided into type-one pins and type-two pins. The end of the type-two pin is threaded. The number of type-one pins is the same as the number of connecting members at the metal node. A single type-two pin is arranged at the centroid position of part A of the metal node. Cylindrical non-through holes and through holes that match the size of the cylindrical pins on part A are distributed on part B of the metal node. By inserting the type-one pins on part A into the non-through holes on part B and inserting the type-two pins on part A into the through holes on part B, and screwing a matching nut onto the threaded end of the type-two pin, parts A and B of the metal node are formed into a whole.

[0015] The above FRP-anti-corrosion wood composite truss structure, the FRP profile is pultruded, and the cross-sectional form is any one of round tube, oval tube, square tube, polygon tube, and special-shaped tube; the cross-sectional forms of the inner and outer sleeves of the double-sleeve connector are the same as those of the FRP profile; the cross-sectional size and wall thickness range of the FRP profile are determined according to the load-bearing capacity of the truss structure.

[0016] The above FRP-anti-corrosion wood composite truss structure, the anti-corrosion wood rod is a wooden rod, including various bamboo materials, its axial direction is the longitudinal direction, and the cross-sectional form is any one of round, oval, square, rectangular, polygon, and special-shaped; the geometric form of the cross-section of the metal sleeve is the same as that of the anti-corrosion wood rod; the cross-sectional size of the anti-corrosion wood rod is determined according to the load-bearing capacity of the truss structure.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. In the present invention, the FRP profile with light self-weight, good chemical corrosion resistance, good insulation performance, simple molding process, and high tensile strength and the renewable and environmentally friendly anti-corrosion wood rod are combined into a truss structure through a specific node connection method, giving full play to the mechanical properties of each material. The amount of metal materials used in the entire truss structure is very small, reducing the consumption of non-renewable energy; the FRP-anti-corrosion wood composite truss as a whole exhibits the mechanical properties of light weight and high strength, and its seismic performance and fatigue resistance have been greatly improved compared with steel trusses and reinforced concrete trusses, and it has more obvious advantages when used in large-span structures.

[0019] 2. In the present invention, the node positions where the components of the truss are connected can achieve ideal hinges. The truss form is simple, the component processing is easy, and it can be prefabricated in the factory and assembled on site, greatly shortening the construction period and having a lower later maintenance cost, which conforms to the concept of building industrialization advocated in our country. At the same time, the combined truss structure has strong designability, and the amount of FRP profile used can be increased by optimizing the layout form of the tension and compression members in the truss, which has far-reaching significance for the popularization and application of FRP. Description of the Drawings

[0020] Figure 1 It is a three-dimensional schematic diagram of the FRP-anti-corrosion wood composite truss structure of the present invention.

[0021] Figure 2 It is a schematic diagram of the tensile member of the FRP profile of the present invention.

[0022] Figure 3 It is a schematic diagram of the compression member of the anti-corrosion wood rod of the present invention.

[0023] Figure 4 It is a schematic diagram of the structure at the truss node part of the present invention.

[0024] Figure 5 It is a three-dimensional schematic diagram of the truss node of the present invention.

[0025] Figure 6 This is a three-dimensional schematic diagram of part A of the metal joint of the present invention.

[0026] Figure 7 This is a three-dimensional schematic diagram of part B of the metal joint of the present invention.

[0027] Figure 8 This is a three-dimensional schematic diagram of the double-sleeve connector of the present invention.

[0028] Figure 9 This is a front view of the double-sleeve connector of the present invention.

[0029] Figure 10 This is a top view of the double-sleeve connector of the present invention.

[0030] Figure 11 This is a three-dimensional schematic diagram of the sleeve connector of the present invention.

[0031] Figure 12 This is a front view of the sleeve connector of the present invention. Detailed implementation manners

[0032] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0033] As Figures 1 - 3 shown, a FRP-anti-corrosion wood composite truss structure includes a FRP profile tension member 1, an anti-corrosion wood rod compression member 2, and a metal joint 3; the FRP profile tension member 1 includes a FRP profile and double-sleeve connectors 4 located at both ends of the FRP profile, the anti-corrosion wood rod compression member 2 includes an anti-corrosion wood rod and sleeve connectors 5 located at both ends of the anti-corrosion wood rod, and a plurality of FRP profile tension members 1 and anti-corrosion wood rod compression members 2 are ideally hinged through the metal joint 3 to form a FRP-anti-corrosion wood composite truss structure; the contact interfaces of the FRP profile tension member 1, the anti-corrosion wood rod compression member 2 and the metal joint 3 can be designed as contact surfaces with a certain friction coefficient according to needs.

[0034] As Figures 8 - 10As shown, the double-sleeve connector 4 includes an inner sleeve 12, an outer sleeve 13 and an end sphere. The inner sleeve 12 is sleeved in the outer sleeve 13. The gap between the inner sleeve 12 and the outer sleeve 13 is used to insert the FRP profile. A number of ribs 15 protruding from the pipe wall are evenly distributed along the axial direction on the outer wall of the inner sleeve 12 and the inner wall of the outer sleeve 13, which are used to fix the position of the FRP profile in the double-sleeve connector 4, ensure the adhesive layer thickness when the FRP profile is bonded to the double-sleeve connector 4, and avoid local weakness. The FRP profile is inserted into the gap between the inner sleeve 12 and the outer sleeve 13 and bonded by pouring epoxy resin glue between the inner and outer sleeves to form a tension member 1 of the FRP profile. One end of the inner sleeve 12 and the outer sleeve 13 are connected together and connected to the end sphere through a cylindrical rod. Metal ribs 14 are evenly distributed along the radial direction of the cylindrical rod at the connection between the cylindrical rod and the outer sleeve 13. The distribution range of the metal ribs 14 is from the center position of the cylindrical rod to the contact surface between the outer sleeve 13 and the cylindrical rod. The shape of the metal ribs 14 is triangular. The length of the right-angled short side is the distance from the outer wall of the outer sleeve 13 to the outer wall of the cylindrical rod, and the length of the right-angled long side is 0.5-1 times the axial length of the cylindrical rod. A through hole 11 is provided on the end sphere, which can be inserted into a type of pin 7 in part of the metal node A to realize the connection between multiple members.

[0035] The outer diameter of the FRP profile is smaller than the inner diameter of the outer sleeve 13, and the difference range is 0.1-5 mm. The inner diameter of the FRP profile is larger than the outer diameter of the inner sleeve 12, and the difference is the same as the difference between the outer diameter of the FRP profile and the inner diameter of the outer sleeve 13. The axial length of the outer sleeve 13 is more than 1 times the outer diameter of the FRP profile, and the length of the inner sleeve 12 is more than 1.5 times the length of the outer sleeve 13. Both the inner sleeve 12 and the outer sleeve 13 are in a variable cross-section form with a larger wall thickness at the end close to the end sphere and a smaller wall thickness at the other end. The maximum wall thickness is more than 1 times the wall thickness of the FRP profile, and the minimum wall thickness ranges from 0.5 times the maximum wall thickness or less. The outer diameter of the cylindrical rod is less than 1 times the diameter of the end sphere.

[0036] As Figure 11 、 Figure 12As shown in the figure, the sleeve connector 5 includes a metal sleeve, a radial strengthening section 19, a bolt 18, a cylinder 20, and an end spherical ball. A protruding radial strengthening section 19 is provided at the middle part of the outer wall of the metal sleeve. A number of threaded holes are evenly distributed radially on the radial strengthening section 19, and the direction of the threaded hole is the centroid direction of the cross-section where it is located. A bolt 18 that matches it is installed in the threaded hole to apply a pre-tightening force to the anti-corrosion wooden pole inserted into the metal sleeve. The number of bolts 18 distributed radially is determined according to the cross-sectional size of the anti-corrosion wooden pole; the anti-corrosion wooden pole compression member is composed of inserting the anti-corrosion wooden pole into the metal sleeve and tightening the bolt 18; the end of the metal sleeve is connected to the end spherical ball through a cylinder 20. Stiffening ribs 16 are evenly distributed radially at the connection between the cylinder 20 and the sleeve. The distribution range of the stiffening ribs 16 is from the central position of the cylinder 20 to the contact surface between the sleeve and the cylinder 20. The shape of the stiffening rib 16 is triangular, the length of the short right-angled side is the distance from the outer wall of the sleeve to the outer wall of the cylinder 20, and the length of the long right-angled side is 0.5-1 times the axial length of the cylinder 20; a through hole 17 is provided on the end spherical ball, which can be inserted into a type of pin in part A of the metal joint A to realize the connection between multiple components.

[0037] The outer diameter of the anti-corrosion wooden pole is the same as the inner diameter of the metal sleeve; the length of the metal sleeve is more than 1 times the outer diameter of the anti-corrosion wooden pole, and the wall thickness of the metal sleeve is more than 0.05 times the outer diameter of the anti-corrosion wooden pole; the protruding thickness of the radial strengthening section 19 is the same as the diameter of the bolt 18, and the axial width of the radial strengthening section 19 is more than 2 times the diameter of the bolt 18.

[0038] As Figures 4 - 7 As shown in the figure, the metal joint 3 has multiple connection ports, and the number, shape, and size of the connection ports are determined according to the size of the truss structure, the layout form, and the shape of the components. The metal joint 3 is divided into part A 3A and part B 3B, both of which show a stepped shape with a thin edge and a thick middle, and are integrally formed; spherical grooves 6 for placing end spherical balls or end spheres are distributed on both parts A and B. Cylindrical pins are distributed on part A 3A of the metal joint. The pins are divided into type I pins 7 and type II pins 8. The end of the type II pin 8 is threaded. The number of type I pins 7 is the same as the number of connecting components at the metal joint 3. A single type II pin 8 is arranged at the centroid position of part A 3A of the metal joint; cylindrical non-through holes 9 and through holes 10 that match the size of the cylindrical pins on part A 3A of the metal joint are distributed on part B 3B of the metal joint. By inserting the type I pin 7 on part A 3A into the non-through hole 9 on part B 3B and inserting the type II pin 8 on part A 3A into the through hole 10 on part B 3B, and screwing a matching nut 8A onto the threaded end of the type II pin 8, parts A and B of the metal joint are formed into a whole.

[0039] The FRP profile is produced by pultrusion and is a solid profile. The cross-sectional shape can be any one of round tube, oval tube, square tube, polygonal tube, and special-shaped tube. The cross-sectional shapes of the inner and outer sleeves of the double-sleeve connector 4 are the same as that of the FRP profile. The cross-sectional size and wall thickness range of the FRP profile are determined according to the load borne by the truss structure.

[0040] The anti-corrosion wooden pole is a solid or hollow wooden member, including various bamboo materials. Its axial direction is the longitudinal direction, and the cross-sectional shape can be any one of round, oval, square, rectangular, polygonal, and special-shaped. The geometric shape of the metal sleeve cross-section is the same as that of the anti-corrosion wooden pole cross-section. The cross-sectional size of the anti-corrosion wooden pole is determined according to the load borne by the truss structure.

[0041] The layout form of the FRP profile tension member 1 and the anti-corrosion wooden pole compression member 2 is determined during the design of the truss structure. The geometric form of the FRP-anti-corrosion wooden combined truss structure can be any one of triangular truss, trapezoidal truss, and polygonal truss. Before arranging the members of the truss structure, first calculate the stress conditions of each member when the truss is subjected to vertical uniform load or vertical concentrated load at the mid-span. Arrange the tension members as FRP profiles and the compression members as anti-corrosion wooden poles, and design the cross-sectional sizes of the FRP profiles and anti-corrosion wooden poles according to the overall stress of the truss. The FRP-anti-corrosion wooden combined truss structure can be assembled into a space truss structure.

Claims

1. An FRP-anti-corrosion wood composite truss structure, characterized in that, It includes a FRP profile tension member, a preservative-treated wooden pole compression member, and a metal joint; the FRP profile tension member includes a FRP profile and double sleeve connectors located at both ends of the FRP profile, the preservative-treated wooden pole compression member includes a preservative-treated wooden pole and sleeve connectors located at both ends of the preservative-treated wooden pole, and multiple FRP profile tension members and preservative-treated wooden pole compression members are connected through metal joints to form a FRP-preservative-treated wood composite truss structure; The double sleeve connector is integrally formed, including an inner sleeve, an outer sleeve, and an end sphere. The inner sleeve is sleeved in the outer sleeve, and the gap between the inner sleeve and the outer sleeve is used to insert the FRP profile. A number of ribs protruding from the pipe wall are evenly distributed along the axial direction between the outer wall of the inner sleeve and the inner wall of the outer sleeve to fix the position of the FRP profile in the double sleeve connector. The FRP profile is inserted into the gap between the inner sleeve and the outer sleeve and bonded by pouring epoxy resin glue between the inner and outer sleeves to form a FRP profile tension member; one end of the inner sleeve and the outer sleeve are connected together and connected to the end sphere through a cylindrical rod. Metal ribs are evenly distributed along the radial direction of the cylindrical rod at the connection between the cylindrical rod and the outer sleeve, and through holes are provided on the end sphere; The geometric form of the FRP-preservative-treated wood composite truss structure is any one of a triangular truss, a trapezoidal truss, and a polygonal truss.

2. The FRP-anti-corrosion wood composite truss structure according to claim 1, wherein The outer diameter of the FRP profile is smaller than the inner diameter of the outer sleeve, and the difference range is 0.1-5mm. The inner diameter of the FRP profile is larger than the outer diameter of the inner sleeve, and the difference is the same as the difference between the outer diameter of the FRP profile and the inner diameter of the outer sleeve; the axial length of the outer sleeve is more than 1 times the outer diameter of the FRP profile, and the length of the inner sleeve is more than 1.5 times the length of the outer sleeve; both the inner sleeve and the outer sleeve show a variable cross-section form with a larger wall thickness at the end close to the end sphere and a smaller wall thickness at the other end. The maximum wall thickness is more than 1 times the wall thickness of the FRP profile, and the minimum wall thickness ranges from 0.5 times to less than the maximum wall thickness.

3. The FRP-anti-corrosion wood composite truss structure according to claim 1, characterized in that, The sleeve connector is integrally formed, including a metal sleeve, a radial strengthening section, bolts, a cylinder, and an end sphere. A protruding radial strengthening section is provided in the middle of the outer wall of the metal sleeve. A number of threaded holes are evenly distributed along the radial direction on the radial strengthening section, and the direction of the threaded hole is the centroid direction of the cross-section where it is located. Bolts matching the threaded holes are installed in the threaded holes to apply a pre-tightening force to the preservative-treated wooden pole inserted into the metal sleeve. The number of bolts distributed radially is determined according to the cross-sectional size of the preservative-treated wooden pole; the preservative-treated wooden pole compression member is formed by inserting the preservative-treated wooden pole into the metal sleeve and tightening the bolts; the end of the metal sleeve is connected to the end sphere through a cylinder. Stiffening ribs are evenly distributed along the radial direction of the cylinder at the connection between the cylinder and the sleeve, and through holes are provided on the end sphere.

4. The FRP-anti-corrosion wood composite truss structure according to claim 3, characterized in that, The outer diameter of the preservative-treated wooden pole is the same as the inner diameter of the metal sleeve; the length of the metal sleeve is more than 1 times the outer diameter of the preservative-treated wooden pole, and the wall thickness of the metal sleeve is more than 0.05 times the outer diameter of the preservative-treated wooden pole; the protruding thickness of the radial strengthening section is the same as the diameter of the bolt, and the axial width of the radial strengthening section is 2 times the diameter of the bolt.

5. The FRP-anti-corrosion wood composite truss structure according to claim 3, characterized in that, The metal node is divided into two parts, A and B, both of which are in a stepped shape with a thin edge and a thick middle, and are integrally formed. Spherical grooves for placing end balls or end spheres are distributed on both parts A and B. Cylindrical pins are distributed on part A. The pins are divided into type I pins and type II pins. The end of the type II pin is threaded. The number of type I pins is the same as the number of connecting members at the metal node. A single type II pin is arranged at the centroid position of part A of the metal node. Cylindrical non-through holes and through holes that match the dimensions of the cylindrical pins on part A are distributed on part B of the metal node. By inserting the type I pins on part A into the non-through holes on part B and inserting the type II pins on part A into the through holes on part B, and screwing a matching nut onto the threaded end of the type II pin, parts A and B of the metal node are formed into a whole.

6. The FRP-anti-corrosion wood composite truss structure according to claim 3, characterized in that, The FRP profile is pultruded, and the cross-sectional form is any one of round tube, oval tube, square tube, polygonal tube, and special-shaped tube. The cross-sectional forms of the inner and outer sleeves of the double-sleeve connector are the same as those of the FRP profile. The cross-sectional size and wall thickness range of the FRP profile are determined according to the load borne by the truss structure.

7. The FRP-anti-corrosion wood composite truss structure according to claim 3, wherein, The anti-corrosion wooden rod is a wooden member, including various types of bamboo. Its axial direction is the grain direction, and the cross-sectional form is any one of round, oval, square, rectangular, polygonal, and special-shaped. The geometric form of the cross-section of the metal sleeve is the same as that of the anti-corrosion wooden rod. The cross-sectional size of the anti-corrosion wooden rod is determined according to the load borne by the truss structure.

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